4 weeks ago steemit algorithm has been updated solving problem with autovoters. In a nutshell:
• If you vote immediately after a post is submitted: The voter gets almost zero, the author gets nearly 100%.
• If you vote 15 minutes after a post has been submitted: The voter gets 50% of the curation reward, and the author gets the other 50%.
• If you vote 30 minutes (or later) after a post is submitted: The voter gets 100% of the curation reward.
Bot owners had not yet realized the greatness of what had happened lol :-)